Photometric measurements of solar irradiance variations due to sunspots

Details Photometric measurements of solar irradiance variations due to sunspots Photometric measurements of solar irradiance variations due to sunspots

Aug 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...343..547c&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 343, Aug. 1, 1989, p. 547-553.

Astronomy and Astrophysics

Astrophysics

17

Astronomical Photometry, Periodic Variations, Solar Constant, Solar Instruments, Sunspots, Data Processing, Faculae, Spectroheliographs, Vacuum Spectroscopy

Scientific paper

A photometric telescope constructed to obtain photometric sunspot areas and deficits on a daily basis is described. Data from this Cartesian full disk telescope (CFDT) are analyzed with attention given to the period between June 4 and June 17, 1985 because of the availability of overlapping sunspot area and irradiance deficit data from high-resolution digital spectroheliograms made with the San Fernando Observatory 28 cm vacuum solar telescope and spectroheliograph. The CFDT sunspot deficits suggest a substantial irradiance contribution from faculae and active region plage.

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